Lens-grinding machine.



E. STEAD.

LENS GRINDING MACHINE.

APPLICATION FILED MAR. 16. 1915. 1,202,235, j Patented Oct. 24,1916.

3 SHEETS-SHEET 1' &

ArroF/VEY E. STEM) LENS QRiNDlNG MACHiNE.

Mme/mow min MAR. 16, mm.

1,992,235. Patented Oct. 24, 1916.

Mm/MM I A T TOHNEY E. STEAD.

LENS GRINDINGMACHlNE.

APPLICATION FILED MAR. 6. 9H)- 1,2Q2,235. Ia rentd Oct. 24,1916.

3 SHEETSSHEET 3,

2 77" .955: IN CNTOR upon.

. mg and supporting one of 'thestandard ERNEST STEAD, OF BINGHAMTON, NEW YORK.

nns-GRIN I G MACHINE.

Specification of Letters Iatent.

I Application filed March 16, 1915. SerialNo. 14,757.

To all whom it may concern:

Be it known that I, Eanns'r S'mno, a citizen of the United States, and resident of Binghamton, in the county of Broome, m

a the State of New York, have invented new and useful Improvements in Lens-Grinding Machines; of which the following, taken in connection with the accompanying dr awings, is a full, clear, and exact descriptlon.

This invention relates. to certain improvements in tool-holders for lens-surface grinding machines, the object being to provide a simple and comparatively inexpensive tool holder which may be used in connection grinding machines.

Another object is to provide means whereby the tool may be more conveniently and accurately adjusted to the work or mecha nism carryingthe object to be operated Other objects and uses relating to specific parts of the device will be brought out in the following description.

In the'drawings Figure l is a top plan of a deviccfor supporting a pair of grinding tools. Fig. 2 is a transverse vertical sectional view of the same device taken on line 2- 2, Fig. 1. Fig. 3 is a sectional view of one of the tool holders as used for receivforms of tools. Fig. 4': is, a sectional view of the same tool holder shown in Fig. 3 with the end section of the inner telescoping mem- 85 her in operative position for receiving and supporting a different standard type of tool. Fig. 5 is av horizontal sectional view through the tool holder in the plane of the guide pins for the sliding clamp. Figs. 6 and 7 are detail perspective views-of the inner telescoping member of the tool holder and disk. Figs. 8, 9, 10, 11 and 12 are perspective views of different standard forms of grinding tools, all adapted to be used with my improved tool holder. Fig. 13 is a perspective view of a portion of a lens-grinding and polishing machine showing the manner of mounting my improved tool holder thereon.

In order that the utility and range of use of my invention may be clearly understood,

I have shown a portion of the frame of a standard form of lens grinding machine 'now'in common use for grinding a plurality 66 of, in this instance two, lenses at the same time and consisting of a. horizontal shelf with various forms of grinding tools or Patented Get. 24, 1.916.

-A having a rib or bead arunning along its front edge for receiving and supfl porting a tlltable bracket -1 having hook-" shape or grooved flanges 2- resting upon the upper edge of the rib awith sui ficient clearance at the front and rears ides: of the rib to allow a limited forward and rearward tilting movement ,of said bracket; This bracket is provided near its ends with upstanding ears or lugs --.3- having vrt'i cally elongated slots -4- for receiving pivotal clamping screws -5 and permit ting a limited vertical adjustment thereof, each clamping screw being engaged in a threaded aperture of a crank arm "on one end of a horizontal shaft or spindle -7-, extending transversely of and above the shelf -A, as shown more clearly. in-

Figs. 1 and 4.

The central portion of the bracket 1s provided with rearwardly projecting ears or lugs -8- and -9- spaced a su cient distance apart to receive between them the shelf -A, as shown in Fig. 2, said ears or lugs being extended some distance rear wardly beyond the rib --aand provided with threaded apertures 10- and -11- at differentdistances from the base of the lugs for receiving adjusting screws -12* and 12 by which the bracket may be ad{ justed upon the rib --a-- to diflerent angles relatively to the shelf -A- clamped in its adjusted position.

Each screw 5- serves as a pivot about and which the crank arm -6' may be adjusted to vary the position of the shaft or spindle -7- and tool-holder laterally and verti cally, while the adjustment of the clamping" screw -5: in the slot -4 serves also to permit vertlcal adjustment of said shaft or spindle. An upright cylindrical tool holder -13- is mounted upon :the spindle, 7 and adapted to be adjusted about the axis thereof and also lengthwise of said axis, and forv this purpose is provided in its lower end with a diametrically extending journal ppening --14.-, in which the spindle 7 1s fitted, said' tool holder being provided the tool holder in its adjusted position, the

with a radial set screw 15- for engaging the periphery of the spindle -Z- to retain portion of the spindle engaged by the set screw being slightly reduced in diameter so that any burs which may be formed thereon; by the set screw will not prevent the BEST AVAILABLE COP\ free withdrawal or turning movement of the tool holder from or upon the spindle when such withdrawal or turning movement is desirable, said reduced portion being elongated axially to allow the lengthwise adustment of the tool-holder previous 1y referred to. v

The axes of the pivotal screws 5 and spindle 7 a r'e parallel and spaced some distance apart and together with theother adjustments previously described permit thetool-holder with the tool thereon to be accurately and expeditiously adjusted to the work-which is moved in a manner wellknown to those skilled in this art, and not necessary to herein illustrate ordescribe for the reasonthat the work-holder and its opcrating means form no invention.

'The major portion of the tool holder -13 above the spindle 7-'- is tubular to. form a cylindrical socket -16- open at the top and slightly enlarged near its upper end to form anannular shoulder 17- for receiving and supporting a cylindrical section or bushing -18 which telesco 5 part of my present 'within the holder 13- and is, provi ed at its upper end with an annular flange 19 normally resting upon the shoulder 17 to limit the inward movement of the section -18. This bushing -18 con stitutes a separable section of the tool holder 13, and while it is closely fitted within said tool holder 13 to turn freely therein for properly adjusting the grinding tool resting thereon, it is held in its adjusted position by one or more set screws 20- engaging in threaded apertures in the adjacent sides of the tool-holder -13-, as shown in Fig. 3.

The upper face of the section 18 is disposed in a substantially flat lane at right angles to the axis of the ho der, said section being provided with a central vertical opening -21- therethrou'gh, preferably rectangular in cross motion, for receiving a radially sliding clamping member -22- which is secured toguide pins -23- moving in parallel guide-openings -24fi-, as shown in Figs. 3, 4 and 5.

The thickness of the clamping plate -22 is considerabl less than the corresponding width of t e opening which. extends to one side of the center of the bushing a greater distance than at the opposite side corresponding to the thickness of the plate --22- so that -this plate may. be moved into the extension to leave a clear central opening of substantially the same cross sectional area as the boss bof a grinding tool B-, shown in Figs. 1, 4 and 10, in which case the bushing section -18-- is provided with a supplemental disk section -18- having its lower and upper faces substantially flat and parallel Otto rest flatwisc upon the upper face of the section 18 and also to form a flat'supporting face for the grinding tool B-, the section 1B'-- being provided with a central opening -'21- registering with the opening-21- except that the portion of the opening which extends the greatest d'istance beyond the center or axis of the holder is reduced in width,"as shown n ,Fig 7 to receive a correspondingly reduced 'gnpping portion -22 on the upper edge of the on the upper edge of t e clamping member --22- extends into the recess -4 and 18 also slightly undercut or dovetailed along its gripping face for interlocking engagement with thevadjaoqnt shoulderaof the grinding tool -C, it being understood that when theiclamping' member 22- is adjusted for securing the grinding tool in place, its reduced gripping portion '--'22-- projects sufiicicntly above the upper face of the bushing section 18- to enter the recess o--. v

The clamping plate -22-- is forced into gripping engagement with the grinding tool C by means of a screw -25-- engaged in a radially threaded a rture in the bushing section 18 an provided with a tapered inner end for wcdging engagement with the face of the plate -29- opposite that-which engages the grinding tool G, as shown in Figs. 3 and 5.

grindi g,

The bushing 18 and grinding tool- Czire provided'with coilperative means for centering the grinding member "upon the bushing consisting, in this instance, of studs -2(3 on the upper face of the bushing entering apertures -27 in the lower face of the grinding tool, this centering means also serving as a part of the locking means for holding the grinding member on the bushing for the reason that when the clamping member --22-- is tightened by the screw -25--, the grinding tool is firmly pressed against the studs -26- to-resist the pressure produced by the tightening'of the clamping plate. When the holder is used to suppoit the type of grinding tool B-, shown in Ft 1, 4 and 10, said holder is held in place 1 a set screw 28 which is enga in a lit) threaded aperture in thebushin an engages I being provided with aperture; 136

,29 for receiving the studs 27- and coiiperating therewith to center {the disk on J the tool C, or if it is desired to use either of the types of grinding t00ls -D-, Fig. 9, and -E, Fig. 11, it is only necessary to remove the bushing section 18, thus permitting either of the sections D or E- to be inserted into the upper end of the socket '16 either side up, each of 15 those grinding tools being provided with an annular rib Z and e', respectively, adapted to rest upon the shoulder -17, after which the particular grinding tool which may be used may be clamped in place by the same set screw which is used to clamp the bushing l8 in place. In like manner, either of the grinding tools '-D .or -E-- may be substituted by another standard form of grinding tool, as F, shown in Fig. 12, and which is separably attached to suitable base portion adapted to rest upon the bottom of the socket 16, leaving the grindingtool -F- projecting in a plane justments provided therefo'r permit the grindingtool to be easilysadjusted to the work to secure the greatest degree of accuracy in grinding, but I do not wish to limit myself to thespecific form of adjusting means, since it is evident that other devices may be used to efl'ect the same result without departing from the spirit of'this invention. c

The same tool holder is adapted to be used in connection with machines having stationary or rotary vertical spindles instead of the horizontal spindle -7, and for this purpose is provided witha central cylindrical bore 30 Fig. 3 adapted to fit upon a vertical spindle, not shown, in which case it is, of course, evident that the spindle 7 would be withdrawn, but the same set screw .15- which serves to tighten the holder -13 upon the spindle -7- may also serve to secure it to the vertical spindle or shaft.

In Fig, 13 is shown a portion of a lens grinding machine adapted for grinding a plurality of, in this instance two, lenses at a time comprising a main, supporting frame 40 carrying the shelf A upon which the tiltable bracket -1 carrying the arms 6 to which the spindles -7 are secured for carrying the tool-holders -13 forming above the upper end of the tool holderthe subject-matter of my present invention, previously described.

Coiiperating with the tool holders are suitable lens-holders -.tl adapted to be operated in any suitable manner not necessary to herein illustrate or describe for the reason that the lens-holder and its operating means form no part of my present invention, the machine illustrated being of the standard type, known to the trade as the hercules grinder, now in common use and manufactured by I'he Standard Optical Company of Geneva, N. Y.

-What I claim. is:

A tool-holder for lens-grinding or pol-- zshm tools, said holder having means for attac ment to either a vertical or horizontal supportfwith its tool-receiving side facing in the same direction.

2. In combination with a lens grinding or polishing tool, a holder therefor, and means for adjusting the holder about separate parallel axes spaced some distance apart.

3. A tool-holder for lens-grinding or polishing tools, said holder having openings at "right angles to each other for receiving eithera vertical or a horizontal support with its tool-receiving side facing in the same direction. i I

4. In combination with a lens grinding tool,"'a holder therefor, a support upon which the holder is journaled for rotary ad- ,jus'tment about an axis at right angles to that of the holder, and means for clamping the tool holder to said support, said support being adjustable rotarily about a different axis, and separate clamping means for the.

support.

5. A tool-holder for lens-grindingor polishing tools, said holder having openings at right angles to each other for receiving either a vertical or a horizontal support with its tool-receiving side facing in the same directidn, and, a clamping device on the holder movable transversely of both openings for retaining the holder on either support.

6. In a lens grinding machine, a holder for a grinding tool, a journal bearing there for at right angles to its axis and upon which the tool holder is adjustable rotarily and lengthwise, Means for clamping the tool holder tosaid bearing, and a rocking sup port for the journal bearing.

7. In a lens grinding machine, the combination with a main-supporting frame, a bracket tiltably mounted on said frame for adjustment to different angles, means for holding the bracket in its adjusted position,

arocking member mounted on the bracket to swing in a plane at right angles to the plane of adjustment of the bracket and provided with a journal bearing some distance to one side of its axis of rocking movement, means for clamping the rocking member 1n its adjusted positioma holder for a grinding tool jOllflltllud on said bearing, and means for clamping the tool holder to the journal bearing.

8. In a lens grinding machine, a holder for a grinding tool, a journal bearing for said holder to permit the latter to be adjusted rotarily thereon, means for clamping the holder in its adjusted position upon the journal bearing, and separate means for rocking 'the' journal bearing and holder thereon in diiferent planes at right angles to each other including separate devices for holding the journal bearing in their adjusted positions.

9. In a lens grinding machine, a grindand tool holder ing tool and a holder therefor comprising engagin a portion of the grinding tool, and

means grin ing tool.

or tightening and releasing the clam ing member against and from the 10. hol'der vin'g means for centering a grinding tool thereon and provided with a central opening, a clamping plate slidable in said opening for'engaging' a grinding tool, and merino for adjusting said plate to clam p the m v 11. In a tool grinding machine, a lens 1%; law grinding machine, a tool.

holder comprising separable telescoping members having cooperative means for limiting their axial movement one upon theother in one direction, the inner member being.provided with means for centering and clamping a grinding tool thereto.

12. In a lens grinding machine, a tool holder comprising separable telescoping members-having cooperative means for limiting their relative axial movement in one direction, the inner member being provided with means for centering and lam ing a grinding tool th ret said'mean inc udin a sliding clampi g ate and ascrew for ac justing thesame. I

In witness whereof I have hereunto set my, hand this 11th day of March, i915.

ERNEST STEAD. Witnesswrv Tnouas ErDmnoiI, Cain. F. Jonmon 

